It actually doesnt look too bad, although difficult to really tell the build quality without actually seeing it... Personally I think 5k is a bit too much for it as it has been to the moon and back on the clock... but if it has been well serviced and maintained then there shouldn't be too many issues with it...
Obviously I would never purchase a lorry/trailer without going to look at it in the flesh so to speak but from the photos there doesn't look a great deal wrong with it to me either apart from maybe being overpriced